To clear some of the rumors etc about the ties between Judo, Kosen Judo and BJJ.

Maeda was a member of the Kodokan and known to be a newaza(Ground fighting) specialists and he also fought in "no holds barred" events back in his time and even allowed one of his opponents to use a knife. Many people have said he was kicked out of the Kodokan but this has been cleared that it is almost certain he didn't.

Kosen Judo was only in a couple of high schools in Japan and it's rules where similar to BJJ but had to part in it.

An email from a Newaza researcher in Japan.

"Dear sir,
Thank you for your email.
Your email is very difficult for me. Because my English ability is poor.

Some people think that difference in kodokan judo and kosen judo is fighting style, not organization.
Kodokan judo have mainly throwing techniques with standing.
Kosen judo have mainly newaza techniques with ground.

The All Japan Judo Association(AJJA) is in kodokan Building.
Therefore,to get the grade or black belt of judo,anyone need enter to the Kodokan,even Olympic players.

The kodokan is only one organization of Japan's judo.
We have black belts of kodokan,we are belonging in AJJA.

Kodokan judo players are allowed match with kosen style, also kosen judo players are allowed match with kodokan style. We are practicing with kosen judo style and kodokan judo style case by
case. Of course we are only training with newaza style at our dojo from first to end.
This is the character of our club."

Maeda taught Carlos Gracie who then taught other members of his family. When Maeda taught Judo in Brazil he called it Jujitsu, Because of this the similarities of the names between Judo and Brazilian Jiu Jistu are similar to Kempo Karate and American Kempo.

"It is not known why Maeda chose to call his style of judo "jujutsu". One explanation is that Kodokan judo wasn't as famous in the 1920s as it is today, and that the traditional term for similar Japanese arts was jujutsu. (In Brazil, the transliteration was more often Jiu-Jitsu.) This explanation seems plausible, inasmuch as the Japanese government itself did not officially decide that the correct name for the martial art taught in the Japanese public schools should be "judo" rather than "jujutsu" until 1925."

Kosen Judo and BJJ are no way attached. Kosen Judo can to some extent be called Newaza Judo and vica versa but it is alot better to call it Newaza(Judo). Dr Jigaro Kano let Kosen Judo go within these high schools because he wanted Newaza specialists. Judo and BJJ are both from Japanese Jujitsu but BJJ is more from Judo.

If you have any questions of the ties between Kosen Judo, Kodokan Judo and BJJ feel free to ask.

On other terms, Don Frye is a 2nd dan in Judo and alot of people don't know this but Carlos Gracie is the founder of BJJ not Helio.